diff options
| author | Aaron Ma <aaron.ma@canonical.com> | 2020-10-03 01:09:16 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-10-14 09:46:22 +0200 |
| commit | fed8fd79e38fcda4e38cda014facf02f48cbed42 (patch) | |
| tree | 2e17cbe56afb9a4bf7e1c0b3189fd99f98ed334d /drivers/platform | |
| parent | 07559a8f5294699863ef7b5b28a505b4d45c7733 (diff) | |
platform/x86: thinkpad_acpi: re-initialize ACPI buffer size when reuse
commit 720ef73d1a239e33c3ad8fac356b9b1348e68aaf upstream.
Evaluating ACPI _BCL could fail, then ACPI buffer size will be set to 0.
When reuse this ACPI buffer, AE_BUFFER_OVERFLOW will be triggered.
Re-initialize buffer size will make ACPI evaluate successfully.
Fixes: 46445b6b896fd ("thinkpad-acpi: fix handle locate for video and query of _BCL")
Signed-off-by: Aaron Ma <aaron.ma@canonical.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/platform')
| -rw-r--r-- | drivers/platform/x86/thinkpad_acpi.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c index 45e78bf6f9bb..9180b24ba60a 100644 --- a/drivers/platform/x86/thinkpad_acpi.c +++ b/drivers/platform/x86/thinkpad_acpi.c @@ -6362,8 +6362,10 @@ static int __init tpacpi_query_bcl_levels(acpi_handle handle) list_for_each_entry(child, &device->children, node) { acpi_status status = acpi_evaluate_object(child->handle, "_BCL", NULL, &buffer); - if (ACPI_FAILURE(status)) + if (ACPI_FAILURE(status)) { + buffer.length = ACPI_ALLOCATE_BUFFER; continue; + } obj = (union acpi_object *)buffer.pointer; if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) { |